pub fn contains_ignore_ascii_case(haystack: &str, needle: &str) -> bool {
    if needle.is_empty() {
        return true;
    }
    haystack
        .as_bytes()
        .windows(needle.len())
        .any(|w| w.eq_ignore_ascii_case(needle.as_bytes()))
}
pub fn now_secs() -> u64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap_or_default()
        .as_secs()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_contains_ignore_ascii_case() {
        assert!(contains_ignore_ascii_case("Hello World", "world"));
        assert!(contains_ignore_ascii_case("Hello World", "HELLO"));
        assert!(contains_ignore_ascii_case("test", ""));
        assert!(!contains_ignore_ascii_case("test", "testing"));
        assert!(!contains_ignore_ascii_case("Hello", "world"));
    }

    #[test]
    fn test_now_secs() {
        let t1 = now_secs();
        assert!(t1 > 1700000000); // Sanity check for recent epoch
        std::thread::sleep(std::time::Duration::from_millis(1000));
        let t2 = now_secs();
        assert!(t2 >= t1);
    }
}